решите уравнения 2 способами:
(x+27)-12=42
115-(35+у)=39
z-35-64=16
28-t+35=53

Х+27=42-(-12)Х+27=54Х=54-27Х=27Х+27-12=42Х=42-27+12Х=2735+y=115-3935+у=76У=76-35У=41115-35-у=39115-35-39=yY=41Z-99=16Z=16+99Z=11528-т=53-3528-т=18Т=28-18Т=10Т=53-28-35-т=-10Т=10